Are you thinking about the lighting in your closet? If you have a big walk-in closet then you definitely need good lighting. And if you have one of those really big walk in closets with maybe an island or a chest of drawers or something similar, you need to find some neat closet lighting ideas.
Track lighting is always cool looking and you might be able to put it in your large walk in colset. You can find some good deals on track lighting at Ikea and other places and if you set it up properly, your closet will be stunning.
Florescent lights are most often used in closets because they are cool (not hot). Electrical codes have distance requirements for all light sources (except LEDs that also run very cool). Closets usually have a lot of things in them with low ventilation that could easily catch on fire from an incandescent or halogen bulb. Luckily, we are talking about a large walk in closet so you will be able to use something other than florescent lights or the usual ugly light that all closets seem to come with. Just make sure you don't have any of your clothes near the lighting.
If your walk in closet is on a side of the house, you could break through the wall and put a window in it. A walk in closet with a window is definitely a step up from most closets and that would provide some nice natural lighting during the day.
Whatever you decide to do with your walk in closet lighting, make sure you are creative to give your closet that out of the ordinary touch.